Radio apparatus



5 Sheets-Sheet 1 June 17, 1930. D F, ASBURY l,7 65,191 I RADIO APPARATUSFiled Feb. '7,v192'r 5 sneets-sheet 2 DOmyFL/sbwcy) June 17, 1930. D. F.AsBuRY I RADIO APPARATUS 5 Sheets-Shee'c 3 Filed Feb. '7, 1927 JungA 17,1930. D ABuRY 1,765,191

RADIO PPARATUS Filed Feb. 7, 1927 5 sheets-sheet 4 t June 1.7, 1930. D.F. AsBuRY RADIO APPARATUS lFiled Feb. 7, 1927 5 Sheets-Sheet 5 "itsPatemed June 17, 1930 STATES .PATNT OFFICE I ['DonsnY F, AsB'UnY, orBRooMns IsLAND, MARYLAND :RADIO Armin-Artis i Application filed February7, 1 927.' Serial No. 166,516.

. My invention `relates to radio apparatus and has particular referenceto improvements inoperating means for the movable parts of tuning units,

variable .plate condensers, my object being to such for example, as

provide `an Operating means of simple, ineX- pensive constructionWhereby the 'movable parts ofa plurality of tuning units may beconnected together for convenient collective and individual operationfor the Various purposes set forth in m'y prior applications se- `riallynumbered .683,756; 689,338; 10293; 172148088;8a448 '108,074v and 155,016and in my `VMore particularly .it'is my-purpose to provide a singleoperator for -the movable parts v 'of a plurality of'tuning units soconstructed and arranged with respect to the units that the movableparts of the units may be moved thereby both collectively andindividually and yet theoperator lcan have 'only a single definiteposition when all of the'units are ac- Vcurately in tune'witli anygiven-Wave length,

the result being vthat it is possible according to my present inventionso to log the operator when-it is 'applied for example to a pluraltuning unit radio receiving set that a person desiring to tune the setwith a particular broadcasting station the wave length of which is knownmay do so immediately simply by setting the operator in the one definiteknown position in which it is possible toset it tohave all unitsltune'accurately with that wave length,` the'necessity offirst securing rough'and then fine adjus'tments of the 'different ;units as has heretoforebeen required to secure the same result thus being entirely eliminated.without the necessity of 'employing means as propjotsedV in certain ofmy prior applicat'ionsjand patents to move the movable parts Vof theunits variable amountsjwith respect 'to one another as they are lmovedcollectively.`v r a j In order'toaccomplish the foregoing pur. poseIprovide an operator having different v, v w

'plural Vtuning' unit radio apparatus disclosforms oftmovemen'ttoflmovethe 'movable 'the'apparatus shown in Figures 1 and 2;

ture shown in Figures 7 and 8';

'parts of the tuning units thereof;

in connection with such an operator it is my fu'rtller purpose toprovide means for indicating When it is in position to cause all unitsto tune with any particular Wave length thereby to facilitate setting ofthe operator in its different definite positions.

With the foregoing and other purposes in view, my invention consistsinthe novel features of construction, combination and arrangement ofparts as will be hereinafter 6 more fully described, illustrated in theaccompanying drawings 'and defined in the appended claims.

. In the drawings, wherein like characters of reference denotecorresponding parts in the different'views Figure 1 is a'frontelevation, partly in section, of a pluraltuning unit radio apparatusshowing a preferred form of my improved Operating means associated withthe movable parts of said units;

Figure 2, a horizontal section on the line '2-2 of Fig. 1

F igure 3, a central Vertical section through Figure 4, a detailperspective of an element of my improved apparatus;

Figure 5`, a fragmentary sectional view through a plural tuning unitradio apparatus showing a modified form of my improved operating meansassociated With the movable parts of the tuning units thereof Figure 6,'a view similar to'Figure 5 showing a positionvofithe operator disclosedin Fig. 5 for Operating the movable part of one '-85 of. the tuningunits individually;

Figure 7, a horizontal 'section through a plural tuning unit radioapparatus disclosing a further modified form of my improved Operatingmeans for the movable parts of the tuning units thereof;

Figure 8,,a'ivertical section on the line 8-8 of Figure 7;

Figure 9, a front elevation of the struc- Figure l1O,`a. horizontalsection through a ing'still'another modified form of'my improvedioperatingimeans for the movabl Figure 11, a front elevation, partly insection, of 'the structure illustrated in Flgure 10.

Figure 12, a viewv similar to Fig. 1 disclosing still another modifiedform of my in- 5 vention; and

, Figure 13, a Vertical section through the structure shown in Fig. 12.

Refrring to the drawings in detail, it willV biobserved that the tuningunits theimovf a e vated y my improved Operating mechamsms are indicatedin the disclosure of each .form of my invent-ion as variable'platecndensers', each including, as usual, a set of stator plates a and a setof rotor plates b, the latter constituting the movable .parts of said,units. It is w to be understood, however, that the tuning unitsvareillustrated herein as variable plate ciondensers merely forconvenie'nce, since they may be of any other form, such, for example, ascoils, the only essential being that each of :them include a partmovable to effect tuning thereof vwith different wave lengt-hs in order`that my improved mechanisms may be adapt- 35 ed to t eir operation. y'w In a preferredembodiment of my invention as disclosed in Figures 1 to4, the tuning units, two in number, are mounted in any suitable mannerupon' any suitable support i such as a base board in side b sidezspecedrelation and with the axes lo their rotor shafts 12disposed inparallelism; On an end w of the rotor shaft vof one ``unit is fixedaspury gear 14 and on the correspondin end of the rotor shaft of the other.unit is ed a spur gear 16. A shaft 18, located betweenthe tuning unitsand tdisposed normally in parallelism with the rotor shafts of saidunits, is =pivoted at one end as at to a brecket 22 secured to the baseboard 10 for swinging move- ,nient in a plane atA ri ht angles to aplane including the axes of ie rotor shafts of the tuning units, andupon the other end rtion of said, shaft is rotatably mounted aj ,ob ordial 24: which extends through an opening 26 in a panel board 28to theexterior of the ap- `paratus 'whereit may begrasped for manipu- V ation.Opening I26Vis elongatedzin the difrection of pivotal movement ofshaft18 and one side Vwall 30 thereof isjdisposed y I ntially in alinementwith the plitehl line of ,of gear 14 While the ot er side wall ,thereofis disposed substantially in alinement with. thepitch :line ofthe teethof gear 1,6,2this for. a Purpose which will esently appear. A spurplnion 34 is 106812 between ,and inmeshlwith the spur gears'lt, 16,'and

' is connected to the knob ,ordiai any suitableyieldable means suchas'the circular- ;go ly corrugated: web 36 inusta'ated in'Fig. 1

1whex'eb the knob'ordiitl'mafbemovndlater-` ar portion 38 thereof a'ainsteither of Vthe walls or 32 without a ectingthe toothed v,a5-engagement between said'spurjpinion and arts of which are intended tobe operi J, -cated gener umts, e letter form of other, bnt'are arranvtions, the ,amount of H om.

I said spur gears, said web serving at the same time to assure rotationof the spur pinion 34 at vall times with the knob or dial 24. Betweenthe knob or dial 24 and a flange 40 on shaft 18 is arranged a crimpedwasher 42 affoit'ng :i frietixlil evioe' serviihg to resist ro len oorrespectto' Shift is, ;a-'ima sdgofiai 'zm-mmm in anyrotatable adlilustedposition in which it is placed. Anot er device indilly at 44 s to resistpivotal niovement of shaft 18, so that'it'will remain manypivotalladjusted ition in which itl is plaoedsai device 44 ing secured to. afixed support such as base board 10 and in- .o cludin as shown in Figura4,' a aifr of yielda ie arms ie, 48 between ;which Shea is slidable, thenormal diance between said arms being less than the diameter of theshaft whereby the necessary friction is aflorded by *u sidfiarms toresist pivotal'moiements of the'- s a s Frictiondevice 44 serves tomaintain shaft 18 normally midway between the rotor shafts of the tvunits soathat' the cylindricel Q0 surface 38 o the knob or dia! 24 isspaoedo slightly from both of the side Walls 30,32 of' the opening 26said shaft :be' capable'of shghtlflexure, howevenso'that y laterallcylindn ;surface ma :bemoved mte'yen' gaglexnenteiter e A t wlllo or 32of sm opening ares tisar ment it is apparent `that knob jo: dial'glfilmie` two difierent forms *ofmowmntby :which the s llir gears` I,entiy ty: a moya e erfs 0 t tnntngyunits'ma moved colectively, onejofVsaid form moyement beingrotation'when the lindrical surface 38 is s acedfrom both of :be walls 30, 32 and the ot er being a body movement i in adirection at ri ht angles to a' plane inciu the axes o thexrotorishaftsof v ,i movementbeing per-n mitted by pivotmg the shaft 18 as 81720anlflpg by elongatmg the opening- 26 in the direction o pivotalAmovement of shaft a; afore- The'tuning sl dywan' I 'n reversedrelationhu so that rotation offpinion, fone direction' wills'erveincrease; the ampuntiof overlap between the tort. o v tator plates of iI 'are inne yponsndlmoburdioimma, i

impart movements to the movable parts of the units 'to secure liketuning results from each of them, while movement of said knob or dialbodily will impart movements to the movable parts' of the units to'secure unlike tuning results therefrom. On the other hand, by pressingthe knob or dial slightly laterally in one direction, its cylindricalsurface 38 will be caused to contact with the wall 30, so thatby'thenrotating said knob or dial while maintaining its cylindrical surface 38in contact with said wall a rolling action of the knob against Vsaidwall will occur and spur pinio-n 34 as a result will, in effect, pivotabout spur gear 14 and as a consequence rotate spur gear 16individually, spur gear 14 remaining stationary due to the wall beingalined with the pitch line of the teeth of said gear, so that Vas theknob rolls against said wall, pinion 34 also rolls against gear 14. Bypressing the knob laterally in an opposite direction and simultaneouslyimparting a rotary movement thereto, cylindrical surface 38' will rollon wall 32 Vand as a consequence pinion 34 will pivot about gear 16withV resultant individual rotation of gear 14.

It will be noted that when the knob or dial is rolled against eitherwall 30 or 82 the spur gear which is alined with the wall against I 50 Iiustnient to which the knob or dial is rolled will be held againstrotation bythe pinion 34 due to the rolling action of the latter againstthe gear.

.arrangement of parts As a result of the having the mode of operationdescribed in the foregoing the manipulation necessary to tune both ofthe tuning units accurately with particular wave length is apparent:

the movable parts of the units collectively until each isvapproximatelyin tune with the 'wavelength desired.v When this has beendone the operator then may be shifted bodily to lncrease the capacity ofoneJ unit and dev lc-rease the capacity of the other if this isnecessary to bring each unit accurately in tune with the `'desired wavelength, or, if one unit has been tuned accurately with the desired wavelength as a result of the collective operation and only the other unitrequires further adbring it into accurate tune with the same wavelength, operation of the individual' unit requiring adjustment may beef- Vfected by .rolling the knob against one or the other of the walls30 or Since the pinion 34 is located between and remains at all times inmesh with the gears 14, 16 and since the latter are rotatable in.opposite directions to accomplish the same tuning effects in each unit,it follows that the knob or dial 24 can have only a single definiteposition when each unit is accurately tuned with any particular lwavelength, and thisA being true it follows that the various definitepositions assumed by the knob when the apparatus is in accurate tunewith dif- `tion of rotation as well as a ferent wave lengths,lrespectively, may be logged or indicated, so that whenever it is desiredto tune the apparatus with a particular wave length all that isnecessary is to move the operator to the single definite position it canoccupy when the units are in tune with, that wave length. In otherwords, since the lnob 24 must have a definite posidefinite positionbodily when both units are in tune with a particular wave length, it ismanifest that once the correct rotated and bodily moved positions of theknob are known for correct tuning of the units with a particular wavelength any suitable means may be employed for indicating thesepositions, so that if subsequently it is desired to tune the apparatuswith that partciular wave length, such tuning may be accomplishedinstantly simply by positioning the knob in 'a definite position throughthe instrumentality of said indicating means. F orexample, an index suchas an arrow 48 may be provided on the panel 28 and graduations 50 may beprovided on the 'flnob or dial 24, so that when a particular one ofthegi'aduations on the knob or dial is registered with the arrow on thepanel the person Operating the apparatus will know that the correctrotated position of the knob or dial has been reached to assure correct`tuning of thev units with' a particular wave length. If the lnob ordial could partake of material movement bodily a second index such as anarrow could be provided on the panel for registry with another of thegraduations on the knob or dial to indicate the correct position of theknob or dial bodily for correct tuning of the units with that valvelength, but since bodily movement of the knob or dial rotates themovable parts of the units oppositely with respect to one another asregards tuning effects and' since such movement of the lmob or dial musttherefore of necessity be relatively slight as it serves merely toproduce a synchronized relation of the ble to provide means which willindicate in a magnified manner movements of the knob or dial bodily tofacilitate accurate bodily positionment of the same. To this end I mount011 the panel 28 a short shaft 52 and fiX to one end thereof exteriorlyof the panel an arm 54 terminating in a pointer 56 adapted forCooperation with a series of (rraduations 58. Shaft 52 further has fixedtchereto a short arm 60 to which is pivoted one end of an arm 62 theother end of which is connected with the shaft 18. Consequently anyshifting movement of the knob or dial bodily will act through thismechanism to swing the arm 54 and its movement w1ll be propor-tionatelygreater than the movement of the knob due to the difference in length ofsaid arm with respect to arm 60. Since movoment of the knob or dialbodily will swing the arm 54 it follows that'swinging movement' of Vsaidarm will'rnove the `knob orjdial bodily and sinoe it is desirable toutilize the arm 54' to move the knob rather than 'to move the 'knobdirectly, althouy h either of these modcs of operation may practiced,the arm 54 preferably Visprovlded with a small knob 64 as a meansoffco'nven'iently swinging the same; Thus, `once the 71,0 correctrotated and bodily moved position i of the knob 24 is known to assureaccurate 'tuning of both units with any' particular wave length the onlyoperation required to tuue the apparatus at any time with that wave isvto grasp the knob 64 and move vit' to register its pointei` 56 with aparticularone of the graduations 58 and rotate the knob or dia-124 untilVa particular one of the graduations thereonis registered with the index48. In further explanation of the fact that the knob or dial 24 can haveonly a single definite tion when both tuning units are tuned accuratelywith 'any.` particular 'wave length it may he p'ointedl out that if thecorrectrotated 315 land'bodily moved positions of the knob or dial wereknown lfor accuratetuni'ng of 'the units with every wave length vwithinthe capacity of.l the 'apparatus no necessit sign of means forindividual y operating the ,unitsl would exit, asu'ch means 'never isused in tuning the apparatus with anyparticular v`wave length onceV'the' correct rotated and bodily moved positions'ofthe knob or'dial tosecure accurate tuning of the units with that a* wave length are known.Since, however, it is 'necessary to adjus'tthe units individually when'determ'ining initially the correct rotated and bodilymoved positionsofthe knob or dial to secure accurate tunin of both units *40 Vwith anparticular wave lengt the utility of means or individuall adj ustingltheunits is apparent, even thoug such means'is never used for tuningthe units'with any particular wave length once the one definite positionof 15 the knob o di l to secure accurate tuning of the units withthatwave length has been determinedi z i i In the embodiment of myinve'ntion illustrated in Figures 5 and 6 the tuning units, valthou hnot shown, are asslned to be duplicates o 'and to he arranged in thesame manl.ner as the tuningunits shown iri Figures 1 and 2, andto carry,res ctively, ,on' their rotor shafts, spur gears 14 162 Located betweenand 'in mesh with said gears is a' spur pinion 34' carried by anoperatin knob or dial 2-1' which knob or dial exten sthrough lan opening26' in a panel 28' to the exterior of the apparatus where it may berasped for manipulation. Said knob or dia is pivoted for universalmovement u on a s herical enlargement 66 at one end o a sha 18' which ishaft is pivoted at its other end to a bracket (notshown 05 bodiment omy invention shown in Figures Vto retainshaft L8' inV any pivotall'onldjlu sli for the provi- .ou er 'convex surface of iiange 72,-` twilltion of the knob 24' .Glam 'rtbtating from the support .with Whlch ii?imw.

the same as shaft 18 of the em- 1 to 3, so that it is nou-rotatable hutean'swing in' a direction at ri ht angles to aplane including the axes othe rotor shafts of the tunin units. A friction device ,44' similar tothe'frlction device 44 of Figures 1`to 3 service ;"70

osition in which' it is placed, and d the. obor dial24' normally in`axi'al' alinmen't with said shaft, a straight resilientrod'QS smalldiamet'eir is .eng'a d neatl at one'ehd w; `'n an opening in the enargeme'n 66 whichi other endti rigid with said shaft and at its engagedneatly in an opening'i'n a plug mem'- her 70 which is rigid with 'saidknob ordial. This rod while thus serving normally to main- 'ao tain theaxis of the knob ordial 24' in aliname-nt with the axis of shaftj18'nevertheless permits pivotal movement of the knob or dia'l about theenlargement 66 as is apparent. Rigid with the knob or dial is an annnhflflange 72 having a convez;l outer surface di posed in .alinement .withpitch line lof ti'ip teeth of pinion 3112 j pair'of fixed sup 74, 76 arelocated,j,respectively, adj'acen thf points of contact of pinion 84'with the 14", 161ml thestsupppfnorlalli atj spacd relation ;with respecta ;the appareut from thi'sarrangementthat. o

a W a spu- 'e 14g 16' 'i s exactly .thesame as described iu gen.nectlonfwit knob 245 ofFiguresl to 4:, exceg that instead ofacylindrical surface' of t knob bein rollable against one side tor'other oft e opening in the panel thro which the knob cxtends to secureindividual operation of the units, this result is attgm' in them diiedform of my invention tiltmgt knob as shown in Fig. 6 to' r' theto'uterface of lflan e 72 intocontact wi 105 0119.91: the otherfof t e suports. 74f,76

the" knob so t at it will bylpivoti thereqn to move the. car remote fromsai upport individually. auf no essentialrespects this modified form,of-any inventinnjhasy the same mode :of operation accomplishes the samevresults as the-,W shownmFiguresl to4. x `.1'.

= In Figures 7 to9 .of the drawingslxhaikm illustrated another;embodiment of my? inyention I which diflers from the embodimantsthereof shown in Figures 1 to 6 mainlylinthat 'bevel gears instead ,ofspur gearsconstit'ute the driving connection between. the operat o knoband the ,rotors ofthe tuning units. f producing this latter form of myinventinn the tuning units are mounted` in any desired manner inrelative spaced relation upon a suitable support such as the baseboardlrii'iW'5 of the apparatus with their rotor shaftah alinement withone another, adjacent eiids of said rotor shafts being equipped withbevel gears 142 16, respectively. A bracket 22", also secured to thebase board, carries a pivot 13 pin'Oa, the `axis of which is inalinementwith the axes of the'rotorshafts of the tuning said'arm iii any..pivoted position in which it is placed. An'annular flange 38a on theknob h'as a conical surface for cooperation with either ofy a pair offixed supports 80.1, 82'? which supports inay conveniently be carried bythe frame portions of' the respective tuniugslunits. Support 30a hasa'surface disposed in alinement with the pitch, line of theteeth-'ofgear 14l while support. 16EL has a surface disposed inali'nement with the pitch line of.l the teeth of gear 16a. VAs a resultof this arrangemen't it is apparent'that by pressing the knob24laterally its flange 88a may be caused to contact with one or theother of the 'supportsrOaV or`32a, so that .by then rotatingthe fknob itwilli rollagainst'the support with ;which flange 38asis in contact andin efiect pivot 'about its point of contact with said support to rotatethe gear 14-1 or 16a, as the case may be,l which is' remote from saidsupport, it being understood that the. amountof tilting movement `of.said knob necessary to `bring its fiange 38a into contact with eithersupport 30a or 32u is so slight that'the normal play between'the teethof bevel pinion 84'1 and-bevel gears 14a, e16a will `permit suchmovement.

-Knob 24a, as is obvious, is rotatable about its own axis aswellasswingable about pivot pin '20a to move the gears 14a7 v16acollectively and for the same reasons set forth in connection with'thedlsclosure of Figures 1 to 4 of the drawings said knob canhave only asingle Vdefinite position when the units are in accu- -rate tuiie withany particular wave length. vFurtherniore said knob is graduated as at'arm 54a is Vdisconnected therefrom, said knob may have unlimitedswinging movement bodily about pivot 20a for rotating the gears 14a, lflcollectively7 in which event the supports 30a, 82a will extend for aconsidei'able disi tance concentric to the axes of the gears 14a,

16a; so thatin any bodily moved position of said ltnob itmay be pressedlaterally against said supports to move said gears individually.

In Figures 10 and 11v I have illustrated a further modification to 'showthat it Yis possible to retain the advantages inherent to the forms ofmy invention previously-disclosed in a structure including an operatorcommon to a pair of tuningunits having only rotary movement` to move themovable part of one of the units and which is rotatable, swingablebodily and rollable to move the niovable part of the otherunit, while atthe same time having only a single definite position when both units aretuned accurately with any particular wavelength. According to this formof my invention the tuniiig units are mounted one behind the other withthe axes oftheir rotor shafts disalined, but extending in paralleldirections equal distances 'radially from a spherical pivot member 20band spac'ed circumferentially lwith respect to said pivot member 90apart. A spur gear 14b is fixedto the rotor shaft of one unit and a spurgear 16b is fixed to the rotor shaft of the other unit. The sphericallpivot member is carried by a bracket 22b secured to any suitable fixedsupportito which the tuning units are secured and is located in theplane of the gear 14b of one of the units as shown. Mounted on saidpivot member for universal movement with respect thereto is a spurpinion 7 S which meshes with spur gear 14. Fixed to said pinion is ashaft 18h which extends across the other tuning unit and has fixedthereto an operating'knob 24') carrying a spur pinion 34b meshing withgear 16h. Knob 24b extends through an opening 26h in a panel 28 andincludes a cylindrical surface 38b adapted for cooperation with a wall32b of vsaid opening which, as shown in Fig. ,11, is

in alin'ement with the pitch line of the teeth of gear 16.- 1 A shortshaft 52'? is mounted in i panel 28h and carries at one end ,anindicatoi' arm 54h and at its other end a short arm 60b to which ispvoted'on` end of an arm 62 which, at its other end, is pivoted to shaft18h. A friction device 44b similar toV that shown in Fig. 4 engages arm62h. As a result of this arrangement it is apparent that with thecylindrical surface 88b spaced from wall 82 rotation of the knob 24bwill rotate the gears 14h, 16b collectively, while gear 16b may berotated individually simply by moving said knob laterally withoutrotatingsame. On

Vthe other hand gear 14b is rotatable individuallyv by pressing the knobto bring its cylindrical surface 38b into contact with wall 82h and thenrotating the knob, this resulting in rolling movem'ent of the pinion 34bwith respect to gear 16b without moving the lattei' and iii rotation ofpinion 78 to rotate gear 14. Knob 24h is graduated as at 50b forcooperation with an index 48b tov indicate the one definite rotatedposition it can occupy when both units are accurately tuned with anyparticular wave length, while arni 54b indicates thev one definitebodily moved position said w knob .can occupy when the units areaccuil'ntel in tune withany' particular4 wave have illustrated a furthermodifieation inventiondiflering from the eceding embodimentsthereofessentially m that means is 'provided wherebyzthe operator, "instead ofbeing -rofimbl'e against a Permanent fixed support or sup forcmoiing themovable parts of thev tuning units 1 individually, is rollable againsta, movable' part of one unitto move the movahle rt of the other .unitindividual- }y,"=the 'mova le 'part of thefirst unit being held.against'movement dungadjustment of the lniovable part of .the secondunit whereby iteonstitutes'; in'eflecta fixed-support from which theoperator reacts tomove the movable party of the second unit. In thisyeinbodiment ofmy invention the tuning units are mounted in thesame'relationas shown'in Figura 1 of the drawings, that is, abreast ands aced with res 'to one another and with 'axes of their rotor shafts"Vdisposed in parallelism. On correspondin ends of said rotor shafts arefi'xed, respective spur gears 14, 16c and Ameshing-with said spur gearsis a spur pinion 34 carried by a knob 24 which is rotat- 'ably mountedon a shaft J and extends through an ning 26 in a anel 28to theexterior'of t e apparatus w ereit may be igrasped for manlpulation. Anarm 18'* i'is 'pivoted at one end as at 20c to a bracket 22` forswinging movement -in 'a direction at right angles to a plane includingthe Amies of the rotor shafts'of the tuning units. The shaftV` 80l ispiv'oted at an intemiediate oint in its length, as at 82, 'to the'free'end 0 arm 18 for swinging movement `-in a direction at right -anges to the directionof swinging movement' of said arm,iand carried byvthe end of said: shaft op ite tothe end there- 'of on whiohknob 24 Ismounted is a small roller 84. The spur gears 14, 16 are provided 'withlateral flanges 86, 88, respectively, with which` brake levers 90, 92are adapt'ed for o0- 'Ioperation res ctively, said brake levers beingintermediate y pivoted to suitable fixed supports and each having oneend disposed in fproximity to the inner face of its related flange andits other end di sed in proximity to* roller`84. As a result o thisarran `ment it is manifest that knob 24'z is rotata le on shaft S0 aswell as bodily' swingable about the pivot 20:to rotatethe spur ars 14,16 collectively. It is manifest also t at by swinging said knob in onedirection about pivot 82, vfoller 84 will'enga'ge one of the levers or92 and swing same on its pivot into braking engagement with its relatedflange 86 or 88 as the case may be, while by swinging said knob aboutits piv'ot 82 in'an opposite direction Vroller 84' will be caused toengage. the other of said levers and swing same on its pivot 7 05 intobraking engagement with its related i nzrignrzs 12 ma lis ufam drswinsio my flange..i.Thus, for example, if knobl 24 is sw to' the rightasshown in Fig. 12 roller S'-Wi l+b0 mvedfl) the? IOBO 61,1 -H' ='-fiwith -one-'endof lower Wandswing saimmnfi` its pivot uhtilz its `otherend. is foreedfiatoj, frictional brak' engagement withthe flow w 8601igear 14% f nqw'mob 24. is rotaiflfl; spur gear 34obviousy mint ro'lloaspurgflr 14 since the latter is hold, against rotaflli andby so roli''onspur gear 14' the other v spur gear 16' a 'be rotatd individually'yW, said spur pinionaslse is'ohvioua' In exaotl the same manner spur gear14% may be rotae ed: individualy by first swringing knob 24'! to theleft as shown in Fig. 12 and then ing said knob.v An indicator arm 54 iscoknected withiarm 18' in the same mannemafl shewn'in-Fig. 1 to indicatethe difierentfdetinite 'bodily'moved positions of the knobfl! when theunitsare in 'accurate tune with tioular wave lengths, and graduationsarepm' vided `ou'V saidknob for cooperation with zl!! indeivo 'the panelto indicate the difisrfl tlefiniteA rotated positionsof said knobm theunitsfane accurately-'in tune withpayumiar wm lengzhs'a being forthesame reasons set. forth in conneetin with the'structure of Fig.i.1,'knob 242m have' only a single definite position when unitsharein timewith an'ypart1cular len '--m From-the foregoin description ;na

in connection with t e aocompanying dni/i:-

ings it'is'believed' that theconstructionmy eration and advantages'of mypresent-inna' ;1.00 tin will"-be fully i'understood. I deslredio point'out, however, that while I have. closed herein'tcertainspecific'embodimenfv zm' *invention various changes and d a ditions maybe made in' and to of them withinz the spirit-and seope of my. mventaon'as defined` in the appended claims.l V ',I`! laim:g

1.-In r'adio apparatus, a pair of tmmxg units a part of each? of whichis movablsgmi operator having continuous driving connectionwithth'eflmovablepart of each unit, means "whereby' saidbperator ismovablei'o move the mcable partsof said units collectively :andindividually, and means coopemtin with sa'id operator toV reventmovemea't ofgv one unit while the ot er unit'is 'being movedindividually by-the operator.

2. 'In radio apparatus,'an adjustable tun'- ing unit,`a rotatable andbodily 'movableactuali' 'constantly in driving) connection'vith saidunit, means opel-able* y either of movements' independently of theotherwto adjust said unit, andl a `'ixedsupport against which saidactuator is adapted to be rolledz-ito adjust said unit. i 1

3. In radio apparatus, a plurality of,V adjustable tuning units, arotatable andbodily movable actuator constantly in driving fconnectionwith said units, means operablejby o V either of said movementsindependently of the other to adjust said units collectively, andeffective by a combination of said movements to adjust one of said unitsindividually, and afixed support against which said actuator is adaptedto be rolled to produce a combined rotary and body movement thereof.

4.111 radio'apparatus, a plurality of adjustable tuning units, arotatable and bodily mova-ble actuator constantly in driving connection'with said units means operable by either, of said movementsindependently of the other to adjust said units collectively, w andeffective by a combination of'said movements to adjust each of saidunits individually, and a fixed support having separate surfaces againstone of which said actuator is adapted to be rolled to produce a combinedrotary and body lmovement thereof effective .to adjust one of said unitsindividually and against another of Which'said actuator is adapted to berolledto produce a combined rotary and body movement thereof effectiveto adjust another of said units individually. i 5; In radio apparatus, aplurality of adjustable tuning units, Van actuator having differentforms of movement, connections between said actuator and unitsresponsive to one form of movement of theactuator, to .30 adjust saidunits collectively in the same tuning status direction and to another`form of movement of the' actuator to adjust said units collectively inopposite tuning status directions, and means toindicate the correctamount of each of said forms of movements with respect to the other tobring each of said units into accurate tune with any given wave length.

6. In radio apparatus, a plurality of ro- 40 tatably adjustable tuningunits, a gear Wheel on each unit, a pinion located between and in meshwith the gear Wheels on said units, an actuator for said pinion, saidpinion being mounted for rotation and for shifting movement bodily andbeing effective by either of said movements independently of the otherto adjust said units collectively and by a combination of said movementsbeing effective to adjust said units individually, and a fixed supporthaving surfaces against which said actuator is rollable to producecombined rotary and bodily shifting movements of said pinion effectiveto adjust said units individually. o In testimony whereof I hereuntoafi'ix my signature. DORSEY F. ASBURY.

